文件列表:

coordinate-spheres\coordinates.html (3509, 2004-12-20)
coordinate-spheres\Ecliptic-10deg.dscNO (194, 2004-12-20)
coordinate-spheres\Ecliptic-10deg-labels.dscNO (15407, 2004-12-20)
coordinate-spheres\Equatorial-10deg.dsc (199, 2004-12-20)
coordinate-spheres\Equatorial-10deg-lablels.dsc (13891, 2004-12-20)
coordinate-spheres\Galactic-10deg.dscNO (214, 2004-12-20)
coordinate-spheres\Galactic-10deg-Labels.dscNO (17447, 2004-12-20)
coordinate-spheres\models (0, 2004-12-19)
coordinate-spheres\models\10deg.cmod (354452, 2004-12-20)

Selden's CMOD Coordinate Spheres for Celestia v1.1 Here are three sets of 10 degree coordinate spheres to help orient you in space. They are defined as Nebulas, so in order to see the coordinate grid and its labels, you must have "Show Galaxies" and "Label Galaxies" enabled. They were defined using Celestia's new CMOD mesh object. As a result, this Addon can only be used with Celestia v1.3.2pre3 or later. If you restore this Zip archive into your Addons (or extras) folder, it should create its files in all the necessary sub-directories. Equatorial-10deg.dsc defines a sphere aligned with the Equatorial coordinate system. Ecliptic-10deg.dsc defines a sphere aligned with the Ecliptic coordinate system. Galactic-10deg.dsc defines a sphere aligned with the Galactic coordinate system. Corresponding *-labels.dsc catalogs are included provide labels for some of the coordinates on the appropriate spheres. As supplied in this Addon, only Equatorial-10deg.dsc is enabled. As a result, this Addon initially will show the Equatorial coordinate system. You can compare it with the "Celestial Grid" built into Celestia. The other DSC catalogs have been disabled by appending "NO" to their filetypes. Having all of the coordinate spheres enabled at the same time can cause visual confusion. Simply rename the DSC files appropriately to see the coordinates you want. Each catalog file uses the same 3D model, but specifies several different orientations. The model defines circles of latitude and longitude separated by 10 degrees, so it's called "10deg.cmod". The DSC files specify a model Radius of 1.0e19. This places their lines far beyond the visible universe for minimal parallax. Unfortunately, some graphics cards have problems when showing models this large. They usuall flicker and blink off and on. If this happens, you will have change the Radius to something much smaller. Apparently 1e6 works, but there will be some parallax. In order to give the 17 circles of latitude a reasonably smooth curvature, those circles each consist of 360 1degree points. As a result, the model is a rather large 350KB. Since CMOD files are just plain text, I have provided only one. Its latitude and longitude circles are specified with slightly different (greenish and yellowish) colors. Edit the file /models/10deg.cmod to use the colors you find appropriate. You could even make copies of the model, so you have one for each coordinate system. If you give them all different colorings, it may be possible to enable them all at the same time and make some sense of how they are related to one another. No rights are asserted. Selden Ball March 6, 2004 (updated 20Dec04 with comments about Radius) ---------------------------- Acknowledgements: The calculations to determine the locations of the coordinate systems' labels were done using routines from the StarLink Project's free software library. Please see their home page at http://www.starlink.rl.ac.uk/ for more information.

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